.button {
    background-color: #4CAF50;
    border: none;
    color: white;
    text-align: center;
    text-decoration: none;
    font-size: 16px
}
.grid-container{
    display: grid;
    grid-template-columns: auto auto auto auto;
    grid-template-rows: auto auto auto auto;
    grid-gap: 10px;
   // background-color: #2196F3;
    padding: 10px;
}
.grid-container > div {
   // background-color: rgba(255,255,0.9);
    text-align: center;
    padding: 20px 0;
    fonrt-size: 30px;
}
.header{
    grid-column-start: 2;
    grid-column-end: 4;
}
.nav{
    grid-column:1;
    border-style: dotted;
}
ul{
    list-style: none;
    text-align:left;
    padding-left:2px;
}
.main{
    grid-column-start: 2;
    grid-column-end: 4;
    grid-row-start: 2;
    grid-row-end: 4;
    background-color: rgba(255,255,0,0.9);
}